Should CROMRO perhaps be CROMOR? The last two words do not appear on any SL decal I have seen, but I do not claim to have seen them all. Usually SL will appear on the decal. Do a search of the forums and you may come up with something.

Cromor is not what is traditionally known as seamed tubing:
Cromor 25 Cr Mo 4 2,190 Cold drawn and double butted, this tube set is ideal for more
demanding riders who favor the use of versitile, high performance frames at an affordable price.

Cromor is not what is traditionally known as seamed tubing:
Cromor 25 Cr Mo 4 2,190 Cold drawn and double butted, this tube set is ideal for more
demanding riders who favor the use of versitile, high performance frames at an affordable price.

More on Cromor: This cro-moly is generally drawn to a tensile strength of 800 Newtons/square mm with 12% elongation, and makes tubes suitable for pro and semi-pro applications. Many people dismiss this tubeset as a "seamed" tubing. This is not true. The usual sense of a seamed tubing is of a plate of sheet metal wrapped around a round form and electro-welded. This is not the construction method for this steel. A billet is the thick, short piece of tubing that is drawn in the tubing factory into the thin, light bicycle tube, and it is this billet that is electro-welded in 25CrMo4. The act of drawing the thick steel tube into the thin tube gives the tubing much of its strength. Many high-tech mills use only electro-welded billets for their tubing fabrication. In any case, this is a high-quality, reasonably priced tubing that is used in some of the most elite of Columbus' tubsets.

Should CROMRO perhaps be CROMOR? The last two words do not appear on any SL decal I have seen, but I do not claim to have seen them all. Usually SL will appear on the decal. Do a search of the forums and you may come up with something.

Whether it is a plate or billet that is welded, it is still seamed tubing. The was nothing wrong with the seamed tubesets of the 1980s but many cyclists still prefer seamless tubing. CROMOR was intended for mid range bicycles and it is excellent tubing in it's range, but I can't refer to it as elite tubeset when Columbus marketed a half dozen or so tubesets that were above CROMOR.

Cromor - good tubing

Very informative thread on Columbus tubing. I'd like to comment that with the information on the WEB about Cromor tubing, particularly the detail contained in this particular thread, this tubing isn't the "economy" quality that I'd previously perceived, and in fact, shows in its performance on my Colnago. The data indicates about a 200 gram increase in weight compared to the SLX tubing, which for my purposes, isn't a very big deal.

Most of that is likely to appear on any Columbus tubing so you have to pick out the tubeset name for it to be useful. For the purposes of translation, I believe "tubi rinforzati speciali acciaio" means "reinforced tubing - special steel " and appears on even the older Columbus tubing that did not have any particular marketing designation like SL or Cromor or anything. "Doppio spessore" means "double butted". I'm not sure if the "tubi rinforzati" refers to the butting, which seems redundent in this case, or to some treatment of the steel alloy. Older decals as well as those for many SL/SP tubesets said "tubi rinforzati" but did not say "Doppio spessore" even though they were double-butted so I'm not 100% sure about that part.

tmk, the "SL" decal wasn't introduced until sometime around or after 1981/2. Up to that time, your "acciaio speciale" sticker meant that the tubeset was a full SL ,SP or a mix depending on the builder and frame size .
As number of the top line and specialised Columbus tubesets increased over time , they introduced the new, more specific decalling for identification as inventories turned over. Some lower volume tubesets and sizes might have taken years to see the change, however.
Afterwards, the "Acciaio Speciale" decal was relegated for custom mixed SL/SP/KL,etc. full tubesets and certified repaints ,esp. when the exact mix of Columbus tubing was undertermined.

tmk, the "SL" decal wasn't introduced until sometime around or after 1981/2. Up to that time, your "acciaio speciale" sticker meant that the tubeset was a full SL ,SP or a mix depending on the builder and frame size .
As number of the top line and specialised Columbus tubesets increased over time , they introduced the new, more specific decalling for identification as inventories turned over. Some lower volume tubesets and sizes might have taken years to see the change, however.
Afterwards, the "Acciaio Speciale" decal was relegated for custom mixed SL/SP/KL,etc. full tubesets and certified repaints ,esp. when the exact mix of Columbus tubing was undertermined.

its a moser of unknown year. after 81 for sure. it also has a sticker of saying that moser picked out the tubing. its a 61cm c-t st and a 59 tt

Hi!
I am helping a friend restoring an 80-ies Zullo, and it has Colombus Cromor OR tubing. Zullo was to my knowledge not known for mocking about or producing mid-range bikes. But then again my knowledge does not extend very far. Seem there is a bit of a bickering going about wheter it was hi level or not(markwebb suggesting it i top stuff, T-mar claimin mid-range is more corect). The zullo has oversized tubing. Have not weighed it yet, or taken pictures, as we took a first look at it today. Ill post a seperate thread on it as we go to work.

The problem, I think, is that the earlier Cromor was seamed. After about 1985 they started cold-drawing the tubing, which makes it essentially seamless. The later stuff is better. Cromor was always spec'ed on mid-range bikes, though. Alelle was the lower range, and the more usual SL, SP, and SLX was the top-drawer tubing.